Azimuth-velocity dispersion diagram (low-resolution case). The top and bottom panels delineate the noise-free and noisy models, respectively. The symbols indicate the mock dispersions, and the solid lines the resulting model fitted to the mock values. The selected radial range is 12 ≤ R ≤ 14 kpc. The dashed lines highlight two extreme models of isotropic orbits, which cannot represent the intrinsinc radially biased orbits at the considered radii.